/* Provide support for both ANSI and non-ANSI environments.  */

/* Some ANSI environments are "broken" in the sense that __STDC__ cannot be
   relied upon to have it's intended meaning.  Therefore we must use our own
   concoction: _HAVE_STDC.  Always use _HAVE_STDC instead of __STDC__ in newlib
   sources!

   To get a strict ANSI C environment, define macro __STRICT_ANSI__.  This will
   "comment out" the non-ANSI parts of the ANSI header files (non-ANSI header
   files aren't affected).  */

#ifndef _ANSIDECL_H_
#define _ANSIDECL_H_

#include <newlib.h>
#include <sys/config.h>

/* First try to figure out whether we really are in an ANSI C environment.  */
/* FIXME: This probably needs some work.  Perhaps sys/config.h can be
   prevailed upon to give us a clue.  */

#ifdef __STDC__
#define _HAVE_STDC
#endif

/*  ISO C++.  */

#ifdef __cplusplus
#if !(defined(_BEGIN_STD_C) && defined(_END_STD_C))
#ifdef _HAVE_STD_CXX
#define _BEGIN_STD_C \
  namespace std      \
  {                  \
  extern "C" {
#define _END_STD_C \
  }                \
  }
#else
#define _BEGIN_STD_C extern "C" {
#define _END_STD_C }
#endif
#if __GNUC_PREREQ(3, 3)
#define _NOTHROW __attribute__((nothrow))
#else
#define _NOTHROW throw()
#endif
#endif
#else
#define _BEGIN_STD_C
#define _END_STD_C
#define _NOTHROW
#endif

#ifdef _HAVE_STDC
#define _PTR void *
#define _AND ,
#define _NOARGS void
#define _CONST const
#define _VOLATILE volatile
#define _SIGNED signed
#define _DOTS , ...
#define _VOID void
#ifdef __CYGWIN__
#define _EXFUN_NOTHROW(name, proto) __cdecl name proto _NOTHROW
#define _EXFUN(name, proto) __cdecl name proto
#define _EXPARM(name, proto) (*__cdecl name) proto
#define _EXFNPTR(name, proto) (__cdecl * name) proto
#else
#define _EXFUN_NOTHROW(name, proto) name proto _NOTHROW
#define _EXFUN(name, proto) name proto
#define _EXPARM(name, proto) (*name) proto
#define _EXFNPTR(name, proto) (*name) proto
#endif
#define _DEFUN(name, arglist, args) name(args)
#define _DEFUN_VOID(name) name(_NOARGS)
#define _CAST_VOID (void)
#ifndef _LONG_DOUBLE
#define _LONG_DOUBLE long double
#endif
#ifndef _LONG_LONG_TYPE
#define _LONG_LONG_TYPE long long
#endif
#ifndef _PARAMS
#define _PARAMS(paramlist) paramlist
#endif
#else
#define _PTR char *
#define _AND ;
#define _NOARGS
#define _CONST
#define _VOLATILE
#define _SIGNED
#define _DOTS
#define _VOID void
#define _EXFUN(name, proto) name()
#define _EXFUN_NOTHROW(name, proto) name()
#define _DEFUN(name, arglist, args) name arglist args;
#define _DEFUN_VOID(name) name()
#define _CAST_VOID
#define _LONG_DOUBLE double
#define _LONG_LONG_TYPE long
#ifndef _PARAMS
#define _PARAMS(paramlist) ()
#endif
#endif

/* Support gcc's __attribute__ facility.  */

#ifdef __GNUC__
#define _ATTRIBUTE(attrs) __attribute__(attrs)
#else
#define _ATTRIBUTE(attrs)
#endif

/*  The traditional meaning of 'extern inline' for GCC is not
  to emit the function body unless the address is explicitly
  taken.  However this behaviour is changing to match the C99
  standard, which uses 'extern inline' to indicate that the
  function body *must* be emitted.  Likewise, a function declared
  without either 'extern' or 'static' defaults to extern linkage
  (C99 6.2.2p5), and the compiler may choose whether to use the
  inline version or call the extern linkage version (6.7.4p6).
  If we are using GCC, but do not have the new behaviour, we need
  to use extern inline; if we are using a new GCC with the
  C99-compatible behaviour, or a non-GCC compiler (which we will
  have to hope is C99, since there is no other way to achieve the
  effect of omitting the function if it isn't referenced) we use
  'static inline', which c99 defines to mean more-or-less the same
  as the Gnu C 'extern inline'.  */
#if defined(__GNUC__) && !defined(__GNUC_STDC_INLINE__)
/* We're using GCC, but without the new C99-compatible behaviour.  */
#define _ELIDABLE_INLINE extern __inline__ _ATTRIBUTE((__always_inline__))
#else
/* We're using GCC in C99 mode, or an unknown compiler which
  we just have to hope obeys the C99 semantics of inline.  */
#define _ELIDABLE_INLINE static __inline__
#endif

#if __GNUC_PREREQ(3, 1)
#define _NOINLINE __attribute__((__noinline__))
#define _NOINLINE_STATIC _NOINLINE static
#else
/* On non-GNU compilers and GCC prior to version 3.1 the compiler can't be
   trusted not to inline if it is static. */
#define _NOINLINE
#define _NOINLINE_STATIC
#endif

#endif /* _ANSIDECL_H_ */
